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v0.5.1
https://github.com/python/cpython
09 December 2020, 11:06:31 UTC
Revision c2870b699eb899f358b843c2d706ce8ca89b2bf4 authored by Victor Stinner on 31 May 2018, 05:35:03 UTC, committed by GitHub on 31 May 2018, 05:35:03 UTC 
bpo-33532: Fix multiprocessing test_ignore() (GH-7262) (#7266)
 
Fix test_ignore() of multiprocessing tests like
test_multiprocessing_forkserver: use support.PIPE_MAX_SIZE to make
sure that send_bytes() blocks.

(cherry picked from commit 5d6c7ed5e340b2311a15f34e968d4bef09c71922)
1 parent 7da7a01
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Tip revision: c2870b699eb899f358b843c2d706ce8ca89b2bf4 authored by Victor Stinner on 31 May 2018, 05:35:03 UTC
bpo-33532: Fix multiprocessing test_ignore() (GH-7262) (#7266)
Tip revision: c2870b6
dup2.c 
/*
 * Public domain dup2() lookalike
 * by Curtis Jackson @ AT&T Technologies, Burlington, NC
 * electronic address:  burl!rcj
 *
 * dup2 performs the following functions:
 *
 * Check to make sure that fd1 is a valid open file descriptor.
 * Check to see if fd2 is already open; if so, close it.
 * Duplicate fd1 onto fd2; checking to make sure fd2 is a valid fd.
 * Return fd2 if all went well; return BADEXIT otherwise.
 */

#include <fcntl.h>
#include <unistd.h>

#define BADEXIT -1

int
dup2(int fd1, int fd2)
{
	if (fd1 != fd2) {
		if (fcntl(fd1, F_GETFL) < 0)
			return BADEXIT;
		if (fcntl(fd2, F_GETFL) >= 0)
			close(fd2);
		if (fcntl(fd1, F_DUPFD, fd2) < 0)
			return BADEXIT;
	}
	return fd2;
}
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